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Message-Id: <20100309194313.447573578@redhat.com>
Date: Tue, 09 Mar 2010 20:39:13 +0100
From: aarcange@redhat.com
Subject: [patch 12/35] config_transparent_hugepage
References: <20100309193901.207868642@redhat.com>
Content-Disposition: inline; filename=config_transparent_hugepage
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From: Andrea Arcangeli <aarcange@redhat.com>

Add config option.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
---
 mm/Kconfig |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -287,3 +287,17 @@ config NOMMU_INITIAL_TRIM_EXCESS
 	  of 1 says that all excess pages should be trimmed.
 
 	  See Documentation/nommu-mmap.txt for more information.
+
+config TRANSPARENT_HUGEPAGE
+	bool "Transparent Hugepage support" if EMBEDDED
+	depends on X86_64
+	default y
+	help
+	  Transparent Hugepages allows the kernel to use huge pages and
+	  huge tlb transparently to the applications whenever possible.
+	  This feature can improve computing performance to certain
+	  applications by speeding up page faults during memory
+	  allocation, by reducing the number of tlb misses and by speeding
+	  up the pagetable walking.
+
+	  If memory constrained on embedded, you may want to say N.

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